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“Blue Bloods” actor Tom Selleck has been stealing water from a fire hydrant — presumably to irrigate his sprawling ranch and avocado farm in drought-parched Southern California, authorities said.

Selleck, who plays the NYPD commissioner on the hit CBS drama, has filled up a commercial water tanker at least a dozen times from a fire hydrant in Thousand Oaks, Calif., since 2013, according to a civil complaint filed by the Calleguas Municipal Water District in Ventura County Superior Court.

The legal filing was first reported Tuesday by the online legal journal Courthouse News.

Calleguas Municipal Water District wants Selleck to pay at least $21,685.55 for investigators it hired and court costs. Other damages would be determined later, according to the complaint.

The water district claims it’s documented seven times when a commercial water truck filled up at a Thousand Oaks fire hydrant before taking it into “the Hidden Valley area where the Selleck property is located,” between Sept. 20, 2013, and Oct. 3, 2013, according to the complaint.

After a cease-and-desist letter was sent to Selleck and his wife on Nov. 26, 2013, the same water truck again swiped water for the actor on Dec. 16, 2013, according to the lawsuit.

The same white water truck made similar water runs again on March 23, 24, 25 and 26 of this year, the civil complaint said.

California is suffering from a historic drought and Golden State homeowners are being forced to slash water use by 25 percent.

A rep for the veteran “Magnum P.I.” actor, now in hot water, could not be immediately reached for comment Wednesday morning.